What kind of material we are going to use to convert the sunlight in to power efficiently. The solar plane cell which uses dozens of silicon panels glued on top of one another. The stack of panels is then rotated 90 degrees and sunlight is focused into the side of the films. Again, a concentrator (i.e. magnifying glass) is used to focus as much light as possible into this little cube, just a few square centimeters across. There are three types of solar panel available-monocrystalline, polycrystalline and amorphous. A solar panel generally consists of a number of solar cells wired together to provide the required voltage and current ratings. Originally, all panels were made from silicon slices cut from a single large crystal. A panel made this way is known as a monocrystalline panel, and these provide the highest efficiency but are more expensive to produce than other types. Some manufacturers have switched to using silicon which has been cast in blocks. These are called polycrystalline panels. They are cheaper to produce and to buy, but they may not perform quite as well as the monocrystalline type when they get hot.